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Fiddler - Fiddler is a debugging program for websites.
HttpWatch - HttpWatch: The ultimate HTTP Sniffer for Chrome, IE and iOS
Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.
Advanced REST Client (ARC) - API testing tool. Which allows web developers to create and test custom HTTP requests.
HTTP Toolkit - Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
Postman - The Collaboration Platform for API Development